pg_attrdef
The catalog pg_attrdef stores column default
values. The main information about columns is stored in
pg_attribute.
Only columns for which a default value has been explicitly set will have
an entry here.
Table 51.6. pg_attrdef Columns
| Name | Type | References | Description |
|---|---|---|---|
oid | oid | Row identifier | |
adrelid | oid | | The table this column belongs to |
adnum | int2 | | The number of the column |
adbin | pg_node_tree | The column default value, in nodeToString()
representation. Use pg_get_expr(adbin, adrelid) to
convert it to an SQL expression. |